If you are concerned that you may have undiagnosed diabetes, then your GP should do a test immediately when you report this. If this is the case, it's likely that at different times you will be experiencing symptoms of both low (hypoglycaemia) and high (hyperglycaemia) blood sugar with the latter being more frequent. Symptoms vary but will almost certainly include a raging thirst that you can't seem to placate, and a need to pee frequently, to the extent that you'll feel like the liquid is passing straight through you. Prolonged periods of hyperglycaemia can cause serious damage to the kidneys and liver, so if you're experiencing this I urge you to seek medical attention as soon as possible.